GENERATING THE OPTIMAL MAGNETIC FIELD FOR MAGNETIC REFRIGERATION

摘要

In a magnetic refrigeration device the magnet is the single most expensive component, and therefore it isrncrucially important to ensure that an effective magnetic field as possible is generated using the least amount ofrnpermanent magnets. Here we present a method for calculating the optimal remanence distribution for anyrndesired magnetic field. The method is based on the reciprocity theorem, which through the use of virtualrnmagnets can be used to calculate the optimal remanence distribution. Furthermore, we present a method forrnsegmenting a given magnet design that always results in the optimal segmentation, for any number of segmentsrnspecified. These two methods are used to determine the optimal magnet design of a 12-piece, two-polernconcentric cylindrical magnet for use in a continuously rotating magnetic refrigeration device.